Adaptive filter strength signalling for geometric partition mode

A decoder, the decoder comprising:

• one or more processors;
• and
• a non-transitory computer-readable storage medium coupled to the one or more processors and storing computer program instructions for execution by the one or more processors, wherein the computer program instructions, when executed by the one or more processors, cause the decoder to perform operations of,
• dividing a current block into at least two sub-blocks;
• obtaining a first prediction mode for a first sub-block in the at least two sub-blocks and obtaining a second prediction mode for a second sub-block in the at least two sub-blocks;
• obtaining a first prediction value for a sample in the current block according to the first prediction mode and obtaining a second prediction value for the sample in the current block according to the second prediction mode;
• obtaining an indicator, wherein the indicator includes information on performing a blending operation for the sample in the current block;
• and
• obtaining a combined prediction value for the sample in the current block, based on the indicator, the first prediction value, and the second prediction value, by:
• determining a sample distance for the sample in the current block with regard to a separation line dividing the current block into the first sub-block and the second sub-block;
• calculating a first weight value according to the sample distance for the sample in the current block and the blending operation which is indicated by the indicator;
• and
• obtaining a second weight value according to the first weight value;
• and
• obtaining the combined prediction value for the sample in the current block, by weighting the first prediction value and the second prediction value, according to the first weight value and the second weight value, respectively.

A non-transitory computer-readable medium having stored thereon instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

• dividing a current block into at least two sub-blocks;
• obtaining a first prediction mode for a first sub-block in the at least two sub-blocks and obtaining a second prediction mode for a second sub-block in the at least two sub-blocks;
• obtaining a first prediction value for a sample in the current block according to the first prediction mode and obtaining a second prediction value for the sample in the current block according to the second prediction mode;
• obtaining an indicator, wherein the indicator includes information on performing a blending operation for the sample in the current block;
• and
• obtaining a combined prediction value for the sample in the current block, based on the indicator, the first prediction value, and the second prediction value, by:
• determining a sample distance for the sample in the current block with regard to a separation line dividing the current block into the first sub-block and the second sub-block;
• calculating a first weight value according to the sample distance for the sample in the current block and the blending operation which is indicated by the indicator;
• and
• obtaining a second weight value according to the first weight value;
• and
• obtaining the combined prediction value for the sample in the current block, by weighting the first prediction value and the second prediction value, according to the first weight value and the second weight value, respectively.